"She smiled for first time yesterday!" she gushed to PEOPLE Sunday at The Second Annual Kidstock Music and Arts Festival in Beverly Hills. "It sounds so corny – and I remember my friends telling me and me being like, 'Yeah, yeah, yeah,' but it's so special. Especially when you're sleep deprived and all you do is change poopy diapers, it's so great to get something in return."
So special, in fact, she warned her husband Todd Thompson, 44, not to take his eyes off their daughter, Jade Marie De Laurentiis Thompson, who was born on March 29. "I was telling my husband before I left, you have to make sure to watch her all day, because she will give you the biggest smile when you least expect it."
The Food Network star and Today show contributor also revealed that the family's latest addition is already inspiring her to try her hand at making gourmet baby food.
"People have been asking me for years to come up with kids' recipes and doing all that because I have a lot of kids that watch the show. And I'm thinking, 'I'm not a mom, not my thing, leave that to the moms.' And now, I'm so into it!"
But the one person who may not be as into it? Her husband: "[He's] like, 'No more puréed food, thank you very much!'" explained De Laurentiis. "Because I try all the recipes out on him first, so then we'll see if Jade likes them."
Regardless, her next cookbook, due out in September, includes a baby/toddler section.